411
FNCA52 TJSJ 221930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST SAT AUG 22 2026
DISCUSSION
CRITICAL FUELS CONTINUE ACROSS THE ISLANDS, WITH MODERATE TO
EXTREME DROUGHT CONDITIONS. DURING THE MORNING HOURS, MOISTURE
CONTENT GRADUALLY DROPPED, THOUGH THEY WERE BRIEF AND DID NOT
REACH FIRE WEATHER CRITERIA. ADDITIONALLY, WINDS PICKED UP,
BETWEEN 10 AND 15 MPH, WITH GUSTS UP TO 20 AND 23 MPH. DUE TO
ABUNDANT MOISTURE LINGERING ACROSS THE AREA, THE RISK FOR FIRE
DANGER SHOULD REMAIN LOW TODAY; HOWEVER, CONDITIONS MAY
DETERIORATE TOMORROW AS A DRIER AIR MASS FILTERS INTO THE REGION,
BECOMING FAVORABLE FOR FIRE SPREAD. RESIDENTS AND VISITORS ARE
URGED TO AVOID OUTDOOR BURNING, AS CONDITIONS WILL ENHANCE
WILDFIRE IGNITION AND RAPID SPREAD.
PRZ014-230800-
SOUTHEAST COASTAL PLAINS-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 10 30
TEMP (24H TREND) 75 (-2) 93 (+1) 76 93
RH % (24H TREND) 85 (-1) 48 (-4) 87 46
WIND 20FT/EARLY(MPH) E 13 E 17 E 14 E 16
WIND 20FT/LATE(MPH) NE 10 SE 17 NE 13 E 17
MIXING HGT(FT-AGL/MSL) 5820 5760
TRANSPORT WND (MPH) E 17 E 17
VENT RATE (KT-FT) 87300 86400
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-230800-
SOUTHERN HILLS-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 10 50
TEMP (24H TREND) 71 (-3) 90 (+3) 71 91
RH % (24H TREND) 97 (+4) 55 (-7) 98 57
WIND 20FT/EARLY(MPH) E 12 E 12 E 11 E 12
WIND 20FT/LATE(MPH) E 11 SE 13 E 11 E 13
MIXING HGT(FT-AGL/MSL) 6400 6390
TRANSPORT WND (MPH) E 17 E 16
VENT RATE (KT-FT) 96000 89460
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-230800-
NORTH COASTAL PLAINS-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 20 20
TEMP (24H TREND) 74 (-3) 92 (+2) 74 92
RH % (24H TREND) 97 (+4) 59 (-6) 98 62
WIND 20FT/EARLY(MPH) E 16 E 13 E 18 E 13
WIND 20FT/LATE(MPH) E 12 E 21 E 11 E 21
MIXING HGT(FT-AGL/MSL) 5480 5670
TRANSPORT WND (MPH) E 17 E 17
VENT RATE (KT-FT) 82200 85050
DISPERSION 5 5
DSI 5 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-230800-
NORTHERN HILLS-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 50 10 30
TEMP (24H TREND) 71 (-3) 90 (+1) 72 90
RH % (24H TREND) 99 (+2) 59 (-6) 100 64
WIND 20FT/EARLY(MPH) E 13 E 12 E 14 E 12
WIND 20FT/LATE(MPH) E 10 E 18 E 9 E 18
MIXING HGT(FT-AGL/MSL) 6550 6510
TRANSPORT WND (MPH) E 15 E 14
VENT RATE (KT-FT) 85150 78120
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-230800-
WEST COAST-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 10 70 10 60
TEMP (24H TREND) 72 (-3) 93 (+1) 73 93
RH % (24H TREND) 98 (+4) 56 (-7) 99 59
WIND 20FT/EARLY(MPH) E 12 E 13 E 12 E 13
WIND 20FT/LATE(MPH) E 10 E 13 E 11 E 13
MIXING HGT(FT-AGL/MSL) 5100 4940
TRANSPORT WND (MPH) E 12 E 13
VENT RATE (KT-FT) 51000 54340
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-230800-
EASTERN INTERIOR-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 30 30
TEMP (24H TREND) 73 (-3) 91 (+3) 73 91
RH % (24H TREND) 96 (+2) 58 (-4) 98 60
WIND 20FT/EARLY(MPH) E 12 E 12 E 12 E 12
WIND 20FT/LATE(MPH) E 12 E 13 E 12 E 13
MIXING HGT(FT-AGL/MSL) 7110 7290
TRANSPORT WND (MPH) E 16 E 16
VENT RATE (KT-FT) 99540 102060
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-230800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 40 30
TEMP (24H TREND) 70 (-3) 85 (+3) 71 87
RH % (24H TREND) 99 (+3) 65 (-8) 100 67
WIND 20FT/EARLY(MPH) E 10 E 11 E 10 E 11
WIND 20FT/LATE(MPH) E 10 E 12 E 9 E 12
MIXING HGT(FT-AGL/MSL) 4780 4820
TRANSPORT WND (MPH) E 16 E 16
VENT RATE (KT-FT) 66920 67480
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-230800-
CENTRAL MOUNTAIN RANGE-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 10 60 10 60
TEMP (24H TREND) 68 (-3) 88 (+4) 69 88
RH % (24H TREND) 100 (+2) 60 (-9) 100 64
WIND 20FT/EARLY(MPH) E 10 E 10 E 8 E 9
WIND 20FT/LATE(MPH) E 8 E 10 E 6 E 11
MIXING HGT(FT-AGL/MSL) 8080 7660
TRANSPORT WND (MPH) E 12 E 12
VENT RATE (KT-FT) 80800 76600
DISPERSION 5 5
DSI 2 6 2 5
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-230800-
CAYEY MOUNTAIN RANGE-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 30 30
TEMP (24H TREND) 70 (-3) 86 (+2) 72 87
RH % (24H TREND) 98 (0) 63 (-3) 100 64
WIND 20FT/EARLY(MPH) E 11 E 11 E 10 E 11
WIND 20FT/LATE(MPH) E 9 E 11 E 9 E 12
MIXING HGT(FT-AGL/MSL) 5970 6030
TRANSPORT WND (MPH) E 16 E 17
VENT RATE (KT-FT) 83580 90450
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-230800-
VIEQUES-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 40 30
TEMP (24H TREND) 79 (-1) 91 (+1) 80 91
RH % (24H TREND) 81 (-1) 57 (-3) 85 58
WIND 20FT/EARLY(MPH) E 14 E 14 E 17 E 14
WIND 20FT/LATE(MPH) E 14 E 14 E 17 E 13
MIXING HGT(FT-AGL/MSL) 3150 3160
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 50400 50560
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-230800-
CULEBRA-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 60 40 30
TEMP (24H TREND) 79 (-2) 92 (+3) 79 92
RH % (24H TREND) 86 (+1) 59 (-6) 90 60
WIND 20FT/EARLY(MPH) E 14 E 14 E 17 E 14
WIND 20FT/LATE(MPH) E 14 E 14 E 17 E 13
MIXING HGT(FT-AGL/MSL) 3130 3290
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 50080 52640
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-230800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 10 30
TEMP (24H TREND) 74 (-2) 94 (+2) 75 94
RH % (24H TREND) 86 (-1) 49 (-5) 90 49
WIND 20FT/EARLY(MPH) E 14 E 18 E 16 E 18
WIND 20FT/LATE(MPH) E 13 SE 19 E 16 SE 19
MIXING HGT(FT-AGL/MSL) 5320 5230
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 85120 88910
DISPERSION 5 5
DSI 4 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-230800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER MCLEAR PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 50 30 20
TEMP (24H TREND) 78 (-2) 90 (+2) 79 90
RH % (24H TREND) 86 (+2) 59 (-5) 90 60
WIND 20FT/EARLY(MPH) E 14 E 16 E 17 E 16
WIND 20FT/LATE(MPH) E 14 E 16 E 17 E 14
MIXING HGT(FT-AGL/MSL) 3170 3210
TRANSPORT WND (MPH) E 20 E 18
VENT RATE (KT-FT) 53890 51360
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-230800-
ST CROIX-
330 PM AST SAT AUG 22 2026
TONIGHT SUN SUN NIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 30 30
TEMP (24H TREND) 78 (-2) 90 (+1) 79 90
RH % (24H TREND) 86 (+2) 63 (-1) 89 64
WIND 20FT/EARLY(MPH) E 14 E 14 E 17 E 14
WIND 20FT/LATE(MPH) E 14 E 14 E 16 E 14
MIXING HGT(FT-AGL/MSL) 4780 4990
TRANSPORT WND (MPH) E 20 E 18
VENT RATE (KT-FT) 81260 79840
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page